| NAT Traversal (STUN) |
| This parameter defines whether the NAT traversal mechanism is activated. If activated (by |
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| choosing “Yes”) and a STUN server is also specified, then the GXV300x will behave ac- |
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| cording to the STUN client specification. Using this mode, the embedded STUN client de- |
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| tects what type of NAT/Firewall router used and displayed the result in Status Page. |
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| If the detected NAT is a Full Cone, Restricted Cone, or a |
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| GXV300x will attempt to use its mapped public IP address and port in all of its SIP and |
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| SDP messages. |
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| If the NAT Traversal field is set to “No, but send |
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| the GXV300x will periodically (every 20 seconds or so) send a blank UDP packet (with no |
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| payload data) to the SIP server to keep the “hole” on the NAT router open. |
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| If the detected NAT is symmetric NAT, then STUN can NOT be used and an Outbound |
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| Proxy or Session Border Controller must be used and this field must be configured to “NO”. |
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| Default is No |
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| TIONS |
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| Subscribe for MWI |
| Default is No. When set to “Yes” a SUBSCRIBE for Message Waiting Indication will be |
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| sent periodically. GXV300x supports both synchronized and |
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| SIP Extension to notify SIP server that the unit is behind the NAT/Firewall. |
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| Do not configure it unless the server supports this special feature. |
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| SIP Compact Header |
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| Default is No. If set to Yes, the header is sent in compact format. This is helpful in stateless |
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| proxy with multiple codec used as big UDP packet is not router friendly during transit. |
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| Voice Mail User ID |
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| When configured, user can access VM messages by pressing “MSG” button. |
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| This ID is usually the VM portal access number, e.g.: 8500 in Asterisk or 8502 for FWD. |
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| Send DTMF |
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| This parameter specifies the mechanism to transmit DTMF digit. |
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| There are 3 supported modes: in audio which means DTMF is combined in audio signal |
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| (not very reliable with |
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| Early Dial |
| Default is No. Use only if proxy or server supports 484 response. |
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| Dial Plan Prefix |
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| Sets the prefix added to each dialed number. |
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Grandstream Networks, Inc. | GXV300x User Manual | Page 33 of 54 |
| Firmware 1.2.3.7 | Updated: 12/2010 |
